题目内容

(1)0.28:0.49(2)0.32:48(3)0.15:
3
20
(4)
3
5
4
15
(3)
1
8
:0.75
(6)
1
4
2
5
(1)0.28:0.49=(0.28÷0.07):(0.49÷0.07)=4:7,
0.28:0.49=0.28÷0.49=
4
7


(2)0.32:48=(0.32÷0.32):(48÷0.32)=1:150,
0.32:48=0.32÷48=
1
150


(3)0.15:
3
20
=(0.15÷0.15):(
3
20
÷0.15)=1:1,
0.15:
3
20
=0.15÷
3
20
=1;

(4)
3
5
4
15
=(
3
5
×15):(
4
15
×15)=9:4;
3
5
4
15
=
3
5
÷
4
15
=
9
4


(5)
1
8
:0.75=
1
8
:0.75=(
1
8
÷
1
8
)÷(0.75÷
1
8
)=1:6,
1
8
:0.75=
1
8
÷0.75=
1
6


(6)
1
4
2
5
=(
1
4
×20):(
2
5
×20)=5:8,
1
4
2
5
=
1
4
÷
2
5
=
5
8
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